From the Continental website:
Surf something besides the Net. Select beach destinations in Mexico, the Caribbean and Belize are on sale. Purchase your ticket by June 11, 2002 on continental.com.
To get the lowest fares, book your reservation at least 3 days in advance; include a Saturday night stay, and complete travel by June 16, 2002.
Other restrictions apply. http://www.continental.com/dash/build_dash.asp?vs_2002_05_15_00